I had to install rear speakers for my dad in his Hilux Extra Cab and did not find any posts on the subject and fortunately stumbled upon the wiring diagram for the speakers. The wires are situated in the front left and right kickplates at the bottom of the plugs as per the diagram and pics attached. Left black(-) and yellow(+) and right white(-) and red(+).

I hope this will help someone with the same problem.

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Last edited by tcbothma on Tue Jul 11, 2017 5:49 am, edited 1 time in total.